Shear-grinder.



JOHN n. SHEPPARD, or WORCESTER, MASSACHUSETTS.

SHEAR-GRINDER.

T0 all whom it may concern.'

Be it known that 1, JOHN H. SHEPPARD, a citizen of the United States, residing at Vorcester, in the county of Worcester and Commonwealth of Massachussetts, have invented a new and useful Improvement in Shear-Grinders, of which the following, together with the accompanying drawing, is a specification.

My invention relates to shear grinders and more particularly to that form of shear grinder in which a shear blade-is clamped or supported in proper predetermined position vwhile being sharpened.

One object of the invention is to provide a shear grinder having means for supporting a shear blade in proper angular position with relation to the grinding or abrading meansso as to insure a proper predetermined angle at the cutting edge of the blade.

Another object of the invention is to provide a shear blade support adapted to cause the blade to travel across the face of the abrading means while the blade is being ground so as to distribute the wear as evenly as possible and not wear a groove in the face of the abrading means.

- Another object of the invention is to pro'-v vide an abrading wheel rotatableabout an axis inclined to the path of the shear blade so as to act at a slight angle to the cutting edge of the blade rather than directly along it.

Another object of the invention is to make lthe various parts-of the vgrinder adjustable so as to adapt it for use with various sizes and types Aof shears and so as t'o permit the user to vary its action Aupon a shear blade as desired.

Other `objects, and advantages will 'appear from the following description taken in con nection with the accompanying drawing, in

whichy Figure 1 is a side view of ashear grinder constructed 1n accordance with my invention, a pair of shears being shown in pos1- tion to be sharpened; Fig. 2 is aplani view of the grinder and shears shown-in Fig. 1;l

Fig. 3 is a view of the grinder and shears from the side opposite that ,shown in Fig, 1; and Fig. 4 is a detail view of the edge of the abrading wheel and a section of4 the blade resting upon it. f

Specification of Letters Patent.

v.to limit motion 'at any A desired Patented Feb. 2, 1915.

Application ined February 27, i914. serial No. 821,526.

Like reference characters refer to similar parts in the diiferent figures. l

The grinder shown in the drawing includes a frame 1 supported upon legs 2.

In the upper portion of the frame is formed a bearing 3 in which turns a shaft 4 carrying an abrading wheel 5, the abradingwheel being secured between a shoulder 7 on the shaft and a pair of nuts 8 threaded onto the end of the shaft. The opposite end of the shaftis provided with a small hand wheel 9, by means of which the shaft may be held while the nuts 8 are being tightened or loosened.

A longitudinally reciprocatory slide' 10 1s guided in'suitable ways 11 formed in the frame 1. The slide 10 is formed with a rack 12 which drives a pinion 13 anda gear 14 passing through a slot 19- in the angle piece and threaded into the frame.

A plate 20 having a pair of spaced upstanding lugs 21 is adjustably secured to the upper face of the angle piece 17 by means of a thumb screw passing through a slot 23 in vthe plate and threaded into the angle piece.

One end of a heavy wire 24 is pivoted in the lugs 21 and retained in place by a cotter pin 25. The other end .of the wire 24 is ent at a right angle, and pivotally supported between a pair of Cotter pins on this end of the wire is a clamp 26, a set screw 27 being provided to secure justed angular osition about the wire.V The clamp 26 is of) inverted U7shape so as to receive one blade 28 of a pair' of shears and support it in proper position to be sharpened by the abradingwheel 5. A thumb screw 29 passes through the leg vof the clamp; 26 whichfis pivotedfuponA the wire 24 and secures the blade '28 of theshears irmly in place by pressingy it against the inner face .ofthe opposite or free leg of the clamp as shown in Fig. 2.

A sto 30 is adjustablyrsecured to the slide 10 by means of a thumb screw 31 so as of the slide in one direction point as determined by the the clamp .in adlength ofthe shear blade being sharpened. Y 2. A shear 'grinder includinglan abrading A shoulder 32 formed on the slide 10 serves to limit motion of the slide in the other direction. I v .Y Y

A projection 33 secured to the stop 30 by a set screw 34 is bent horizontallyat its upper end to which is pivoted a weight 35 adapted to rest upon a shear blade being sharpened andv press it against the abrading wheel.

One end of the slide is provided with a finger hole 36 so that it may -be conveniently grasped and reciprocated in order to drivey the vabrading wheel and move the shear blade back and forth along its surface.

. A small cup 37 is provided to hold water into which the abrading wheel may dip angle to the cutting edge of the blade as 1n-V dicated in Figs. 2 and L1. Adjustment of the plate allows the shear blade yto assume a position at an angle to the Vpath of motion of the slide, as shown in Fig. 2, so as to cause the blade to travel back and 'forth along the face of the abradingl wheel. This distributes tlie wear on the' wheel and prevents the formation of grooves. Adjustment of the angle piece 17 vertically permits the shear blade 28 to be supported in a substantially horizontal position so as to move properly along the surface of the abrading wheel. Adjustment of this same angle piece 17 angularly about the thumb screw 18 permits longitudinal adjustment of the shear blade 28 .so thaty the abrading wheel will reach the inner end of the blade. The stop 30 is adjusted to stop the slide 10 just as the abrading wheel reaches the extreme outer end of the blade.

The outer or free leg of the clamp 26 is beveled at its forward edge 38 so as to press against the blade 39 of the pair of shears and hold' it away from the abradin wheel while the blade 28 is being sharpene While I have shown and described the details of one form of my invention, I do not wish to be limited to such details as changes l may be made without departing from th spirit of the invention; but- Having described my invention, whatI v claim as new and desire to secure by Letters Patent is: Y

1. A shear grinder including .an abrading wheel, a reciprocatory support'for holding a shear blade against the peripheral surface of the abrading wheel, and means for rotating the abrading wheel inV a plane inclined to the path of the blade and its support.

wheel, a reciprocatory support for holding with for rotating the gear wheel, the vvplane v of rotation of the gear Wheel being inclined to thev path of said set of gear teeth to permit the abrading wheel to be rotated in'a plane inclined to the and shear blade.

3. A shear grinder including'an abrading wheel, a reciprocatory support for a shear path of the support blade, and yielding vmeans* forv pressing the blade against vtheabradin `wheel. 14. A shear grinder inclu ing an abrading wheel, a reciprocatory support for ashear blade, anda weight pivotally` connected to the support to rest upon the blade and press it against the abrading wheel.

5. A shearv grinder including an abrading wheel, a reciprocatory support for a shear blade, a stop attached to the support tolimit the extent of its motion, and a weight pivotally connected to the stop to rest Vupon the blade and pressit against the abrading wheel. Y f

6. A shear grinder including an abrading wheel,:a universally adjustable support for a .shear blade, and meansfor causing relative reciprocatory motion between Y the abrading wheel and support.

7. A sheargrinder including an abrading di wheel, and a reciprocatory support for holding a shear blade-against the peripheral sur-V face of the abrading wheel, the support being adjustable to vary the angle between the blade and itsline of motion in a plane substantially tangent to the' abrading wheel at its point of contact with the shear blade. 8. A shear grinder including an abrading wheel, a reciprocatory support for a she r= blade, the support having .al face to Contact with the inner face ofthe blade and hold vit at a predeterminedV inclination to the face of the abrading wheel.,- l'

9. A shear grinder including an abrading wheel, and a reciprocatory support to hold a shear blade at an angle to the line of motion of the support, whereby the blade will travel across the face of the abrading wheel as it is reciprocated with its support.

10. A shear grinder including Yan abrading wheel, and a reciprocatory support to hold a shear blade at an angle to the line of motion ofthesupport, whereby the blade will travel Vacross the face of the abrading wheel as it is reciprocated with its support, the support being adjustable to vary the angle between the shear blade and the line of motion of its support. v

11. A shear grinder including an abrading wheel, and a reciprocatory support for ibo Y moe eel y g55 one blade of a lpair of shears, the support sharpened by the abmdng Wheel and for being `fogmod to hold the other blade :may holding the other blade away from the from the abmding Wheel While the rst abradng Wheel. blade s being sharpened. JOHN H. SHEPPARD.

i2, A shear grlnder lncludng an abrud- Witnesses:

Wheel, and means for supportmg one FENELOPE COMBERBACH, blade o a pau' of shears 1n posltlon to be NELLIE Vl/HALEN. 

